Removable concrete insert plug



Jan. 2, 1945. l. G. HAsKE-LL I 2,366,401

REMOVABLE CONCRETE INSERT PLUG Filed May 25, 1945 f/n G. HAS/(14 BY ATTG/@NEX Patented Jan. 2, 1945 UNITED STATES TENT OFFICE REMOVABLE;CONCRETE INSERT PLUGV 'Ira' G. Haskell, -San Francisco, Calif-lApplication May 25,194.3,- Serial No. 488,380 vs` olf-aims. (o1. 2511sTheY presentv invention relates to removable concrete insert plugs',andY in. particular to suchv devices as are adapted to position athreaded nut orsimilar operationv into` al body material Wherein` it isdesired to have any imbedded nut. The invention nnds special advantagein positioning nuts in.concrete,. mortar and the like-Which are pouredor applied in semi-fluid or plastic: condi tion' and. which.harden-Kupon being deprived of moisture. i

In lcuiildingl 'operations it is well known that much construction workemploys; temporary I forms into which ,orv upon which concrete mix ispoured toiiorm', when hardened, a walli or floor. In manyinstancesit' isdesired to hangpipes, fix-- tures or the likeuponthese walls or suspendlthem from a ceiling. Therefore, it is desirable that a hole bepre-formed? in the concrete for fastening they object thereto.. Where itis desired to mount a xture or a bracket,- it is desirable to have a`threaded nut` imbedded in the concrete at the bottom of the hole wherebythe fixture or bracket vmay be threadedly connected.r It isespeciallyadvantageous that the means'` for forming such hole or for positioningthe nut be readily removable', both with respect to the hardenedconcrete and also thel temporary forms.

Among the objects ofthe invention are to provide adevi'ce forpre-forming a hole or for posi-- tioning a threaded nut or the like inaplastic body which hardensupon setting. Another ob' ject isto providefor positioning' a4 nut orthe likeina predeterminedfposition relative toforms into which plastic material is to be poured', and which devicelmay be readily removedl from the plastic' material. after it hasAhardened; leaving the nut in; the accompanying drawing, and'pointed outinthe claims heretovappended, it being understood that various changesin theA form, proportion, size and details of construction of theapparatus may be resorted to within the scopeof the appendedclaimswithout departing from the spirit or sacrificing any of theadvantages of' the invention. Y

ToA more clearly* comprehend the invention, reference is direotedto theaccompanying drawing,I wherein:

Fig.. 1` is a sidey elevation of theinvention partly in-section.

Fig, 2 is a front view' of a key locking plate.

Fig. 3 isA a side elevation partly in section ofk a.

' mo-diiied ormof the device shown inFig. l.

Fig. 4 is a side eleva-tion partly in section of another modified formof device shown in Fig. 1.

Eig. 5. is a fragmentary perspective view of the structure shown invFig. 4.

` Fig.. 6 is a. side elevation partly in section of ay modified formofthe invention.

Fig. '7 is a bottom viewfof the structure of Fig. 6. Referringtothedrawing' inv which likereferenceacharacters indicate corresponding partsin the several Views, l0 is a shank of a pole-like. plug member,lpreferably tapered conically from a. central portion toward. one end.Where the device isrdes-ired for use-insetting a nut into ooncretetheend ofsmaller diameter of the tapered shank. is provided with threadslilfor mounting thereon of a correspondingly threaded nut 12;.

andtherebeyondfthe said end may have a portionv of lesser.y diameterwhich provides an integral rounded. head' orr butto-n i3 which will passthrough` thel openingl in the nut and provide a button which may behammered Without mutilation of *the threads1 at the. tapered end of lthey shank.. The end of the tapered shank of smaller diameter of slightlylarger diameter than its adjacent, threaded portion so that the threadsmay readily pass through the opening left in the. from' concrete upon.removal of the insert plug the hardened concretev body.

. The opposite end of` the sh'ankis for insertion' in one; Wall: of thebody ofthe usual temporary ypouring forms, which,r in theA case of avertical wall,y are relatively spaced and between whichrtheserni-iluidfy concrete is poured; whereas, in the case of ahorizontal licor. or ceilingA there may be.

only one horizontal form, usually called a deck I4, whichr islillustratedr herein as exemplifying. onezuse'to-which the invention maybe put.

In` Fig. 1 said opposite; end ofthe shank is provided; with.ar fixedaxially extended stub member l5 whichv preferablyfh'as its side wallsflattened for engagement byy a wrench, 'such Walls being 1 i11ustratedherein as hexagonal in lateral transverse section. After the temporaryforms' have been erected; suitable holes I'B are bored at predeterminedplaces` in the forms and the stub I5V isins'erted therein, preferablyhaving engagement with thefwalls ofthe hole along the angles formed bythe intersecting planes of the stub walls and thereby providingsufficient grip between the stub and the forms so that the stub willnormally be held in place in a circular hole and yet not provide such alarge frictionally engaged area so that it will be diincult to removethe forms after the concrete has hardened. If the t of the stub l5 inhole l5 is substantially snug, a hammer fmay be employed to tap the heador button I3 and drive the plug into the hole. To further insure themaintenance of the device in the form against inadvertent removal suchas striking thereagainst of the foot of a workman on a deck or by thepouring and agitation of the concrete mix, a releasable locking meansindicated Il is provided. In Fig. 1 this locking means cornprises amachine screw I8 threadedly engaging a threaded recess in the stub l5,and a slotted key plate I9 having an o-pening 26 through which the headof screw I8 may be inserted and a narrower communicating slot 2| inwhich the shank of the screw may slide. Other forms of releasablelocking means may also be employed, but the screw and key plate in Fig.1 provide the advantage of being adjustable in the event thatthe formsare of greater thickness than the length of the stub'15. Intermediatethe ends of the insert plug and preferably at the juncture of thetapered shank Ill and the stub l5 there is provided a xed radiallyextending shoulder ange 22 providing at one face a base 23 and havingits opposite face tapered upwardly and inwardly, preferably arcuately asat 24 from the circumferential edge of the shoulder ange toward the baseof the tapered shank.

In the modications of Figs. 3, 4 and 6 of the members IU, Il, l2, I3 and22 may be the same asin Fig. 1.

It may sometimes happen in pouring forms for vertical walls where twospaced forms are neces* sary that the setting of a concrete insert plugmay have been inadvertently omitted until the forms have reached anelevation far above the points at which it is desired to place one ofthe insert plugs. Usually the form of device shown in Fig. 1 may beutilized in such an instance by cutting the usual hole I6 in the formand piloting the removable insert plug down between the forms on asuspended wire and feeding the stub l5 into the hole by fishing with anysort of suitable hook or bent wire inserted through the hole. However,if this is impractical, either because of location of the omittedremovable insert plug or because of having omitted a large number ofthem ,the modications of Figs. 3 and 4 are advantageous.

In the modification of Fig. 3 the hole Ilia is cut into the form at thedesired p-lace and the assembly of shank Il), nut l2 and shoulder ilange22, together with a ller member or collar 25, are inserted through thehole. Manifestly the hole la must be cut of sufficient diameter toreceive such member therethrough. The ller member or collar 25 fills thevacancy around the stub I5 so as to provide a snug t in the hole 16d.The key plate I9 may be employed as a releasable locking means and thedevice stabilized relative to the form by nails 25 driven through theends of slot 2| and into the forms. Similar nails for a similar purposeVmay also be employed if desired in the device indicated in Fig. 1.

In Figs. 4 and 5 a modification is shown wherein the stub member |5a isprovided with `two aty sides 21 and has intervening portions of itscircumference threaded as at 28. Thus, the at sides are suitable forengaging a tool for removal of the device, as hereafter explained, andthe threads serve to engage a recessed nut 29 in which the collarportion 3U fills the vacant area of an enlarged hole 16a, and the top orcap 3| serves as a hangs-engaging the outer face of the pouring forms tostabilize the insert plug in position. Nails 26 may also be employed tofurther stabilize the insert device, especially if the device were beingused in overhead forms.

In themodication of Fig. 6 the stub for engaging in the pouring formscomprises a spike member |5b which may be driven into the body of thepouring forms. Where the spike member |512 is employed, yit is preferredthat it be foursided and tapered similar to a pyramid having its sidesarcuate or dished at their base, as indicated in |50 in Fig. '7 so thatthe frictional grip in the body of the forms will be over a diminishedarea.

In operation the insert plugs are set in the body of the forms atpredetermined places, those of the types of Figs. 1, 3' and 4 beingsuitable holes cut in the forms to receive them, and the modification ofFig; 6 being driven into the body of the form. The locking means l1 isthen engaged and nailed, if necessary. Where it is desired to imbed anut in the concrete, the nut I2 is mounted on the threaded end of theshank when the insert plug is positioned in the forms. The concrete orthe like is then poured into the prepared temporary forms, agitatedwhere necessary to settle it and permitted to harden in the usualmanner. Obviously, the concrete surrounds the shank |0 of the insertplug and including the nut l2; and the tapered face 24 of the flangedshoulder member 22 is imbedded in the face of the concrete with theopposite face or base of the flanged shoulder substantially co-planarwith the face of the concrete, while the stub member is engaged in thebody of the forms. After the concrete hardens to the desired extent, thelocking means is removed from the stub and the temporary pouring formsare likewise removed. This leaves the insert plug set in the hardenedconcrete with the stubs I5, |5a, I5b extending from the face of theconcrete. The stub being of such shape as to be readily engaged by atool such as a Wrench, may be gripped for axial rotation. Manifestly,the nut |2, which will be of the angular type, will not rotate with theshank, but will remain set in the hardened concrete. Because of theupward and inward incline of the upper wall 24 of the shoulder flangeand the taper of thev shank I0, those members will break the seal withthe concrete very readily, whereupon the plug may be pulled from theformed hole in the concrete wall. Where the nut l2 is employed, itbecomes fiXedly imbedded at its predetermined position in the concreteand the rotation of the shank relative thereto releases the shank forremoval from the nut. In fact, the relative threaded engagement of theshank and nut facilitates the removal of lthe shank from the concreteupon rotation of the shank, since the pitch of the cooperating threadsforces the shank and shoulder flange from their seats in the concrete.

It is to be understood that I have used the term concrete herein in ageneric sense to include all types of plastic or moldable material whichmay be poured or formed in a fluid or semi-huid state and hardenedthereafter. The mode of operation of the device would be identical inuse with all such materials.

Havingr thus described the invention, what is claimed as new andpatentable is:

1. A removable concrete insert device comprising a plug having a taperedshank at one end portion and having at its opposite end an integral stubextension portion adapted for engagement into the body of pouring forms,and said plug having intermediate its stub and shank an integralradially, outwardly extended shoulder member which has one of its facessmooth and tapered inwardly and upwardly toward the tapered end of theshank.

2. A removable concrete insert device comprising a plug having a shankat one end portion, the said shank being threaded for mounting a nutadjacent its terminal end, said plug having at its opposite end anintegral stub Aextension portionl adapted for engagement into the bodyof pouring forms, and said plug having intermediate its stub and shankan integral radially, outwardly extended shoulder member having one facesmooth and tapered inwardly and upwardly toward the nut-receiving end ofthe shank.

3. A device of the character described, including a tapered shank at oneend portion and having its smaller end threaded for-mounting a nut, saidplug having at its opposite end an integral stub extension portionadapted for engagement'25 into the body of pouring forms and said plughaving intermediate its stub and shank a radially, outwardly extendedshoulder member which has one of its faces smooth and tapered inwardly.and upwardly toward the tapered end of the shank.

4. A removable concrete insert device comprising a plug having a taperedshank provided at its smaller end portion with a thread to receive athreaded nut and having a portion extending therebeyond of lesserdiameter than the threaded portion, said plug having at its opposite endan integral stub extension portion adapted for engagement in the body ofpouring forms and having its sides flattened for engagement by a tool,and said plug having intermediate its stub and shank an integralradially, outwardly extended shoulder member having one face taperedtoward the smaller end of the shank.

5. A device of the character described, including a tapered shank havingat its smaller endv a portion adapted for mounting a nut, said plughaving at its opposite end an integral stub extension portion adaptedfor engagement into the body of pouring forms and having locking meansfor releasable engagement by a lock member, said plug mavingintermediate its stub and shank an integral radially, outwardly extendedshoulder member having a smooth face tapered toward the smaller end ofthe shank, and a lock member for releasably engaging the locking meansof the stub, whereby the plug may be secured against inadvertent removalrelative to the pouring 5 forms.

l0 stub extension portion adapted for engaging into the body of pouringforms, said plug having intermediate the tapered shank and stub anintegral radially, outwardly extended shoulder member providing a flatbase at one face thereof ,for contacting the forms and having itsopposite face smoothly tapered inwardly and upwardly toward thenut-receiving end of the shank.

7. A concrete insert device of the character described, including atapered shank having at its smaller end portion a thread to receive athreaded nut and having a portion extended therebeyond of lesserdiameter than the threaded portion, said plug having at its opposite endan integral stub extension portion adapted for engagement into the bodyof pouring forms and provided with flattened sides for engagement inremoving the plug from poured concrete, a shoulder member intermediatethe stub and shank vand extending radially outwardly from the axisthereof, said shoulder member having one of its faces tapered inwardlyand upwardly toward the nut-receiving end of the shank.

8. A removable concrete insert device comprising a plug having a shanktapered from a base toward an end portion threaded to receive a threadednut and having a portion extended J therebeyond of lesser diameter thanthe threaded portion, said plug having at its opposite end a stubextension portion adapted for engagement 0 into the body of pouringforms, said stub having flattened sides for engagement in removing theplug from poured concrete and having locking means for releasableengagement by a lock member, an integral shoulder member intermediatethe stub and shank and extending radially outwardly therefrom, one ofthe faces of said shoulder member being tapered smoothly inwardly andupwardly 'toward the nut-receiving end of the shank, and a lock memberfor releasably engaging the locking means of the stub, whereby the stubmay be secured against inadvertent removal relative to the pouringforms.

f IRA G. HASKELL.

